Restoration of tape magnetic circuits of the PL and ShL series. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Restoration of tape magnetic circuits of the PL and ShL series. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies

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Often, in the process of manufacturing transformers on a tape rod twisted magnetic circuit, its plates delaminate. This leads to difficulties in assembling the transformer and increased buzz in operation. If it is not possible to replace a delaminated magnetic circuit, it is not at all difficult to restore it.

In the manufacture of a magnetic circuit at the factory, a workpiece wound from a steel tape is impregnated with a special binder compound, after which it is sintered at a high temperature. Since the compound becomes very brittle after hardening, under mechanical loads and shocks, the finished magnetic circuit can delaminate into several blocks and even individual plates.

Recovery consists in gluing blocks and plates into a single whole. The best glue for this purpose is "Super Glue" (made in Japan, Osaka), packaged in tubes. When buying glue, you should give preference to the most liquid, with thickened glue it will be more difficult to achieve good results.

If only one end of the U-shaped part of the magnetic circuit has delaminated, then first it is necessary to compress the second end with a clamp so that the delamination does not go further. Then a few drops of glue are applied to the cracks from all sides. In order for the glue to penetrate deep into the cracks, several times within 10 ... 15 s they squeeze with their fingers and release the package of plates. If necessary, add 2-3 drops of glue to where it has completely gone into the cracks.

After that, the glued end is compressed with a second clamp, the extruded glue is removed with a cloth flap and the magnetic circuit is left in a warm place to dry for a day. If the delamination has reached the curved section of the magnetic circuit, compression of this section should also be ensured, for which the magnetic circuit is clamped in a vise (through rubber gaskets), having previously prepared a wooden spacer with roundings of the desired radius.

When clamping the magnetic circuit with a clamp or in a vise, avoid excessively high compression forces. This can violate its integrity and aggravate the delamination.

In the case when the magnetic circuit is stratified into separate plates and blocks of plates, then they begin by finding their place for each part. Assemble the package "dry" and make sure that the polished ends form a perfectly flat surface. After that, the already described operations of applying glue, compressing the package, clamping in clamps and vices, and drying are performed.

Glue "Super Glue" for the restoration of magnetic circuits is best suited. It has good fluidity, provides high bonding strength, is non-flammable, moisture resistant after hardening, does not require obligatory degreasing of surfaces (if they have not been dipped in oil).

However, it must be remembered that it provides only one attempt to restore the magnetic circuit, since it begins to harden after 1 ... 2 minutes, and after an hour the adhesive seam can withstand quite large loads. Therefore, before opening the tube with glue, you should carefully prepare all the equipment, think over the sequence of actions and rehearse the process.

Glue streaks after drying are cut off with a knife or removed with a file. The mating surfaces of the magnetic core are carefully cleaned of traces of glue, first with a safety razor blade, and finally - on a sheet of polishing sandpaper placed on a sheet of glass. This last operation is especially necessary for the magnetic circuit, which has been very heavily stratified.

Author: Yu.Arkhipov, Moscow

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